Folding Knife Blade Guard and Locking Mechanism
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Solution Overview
Problem
Folding knives with blades longer than the handle pose a safety risk due to exposed blade portions when closed, limiting the use of such designs as few incorporate effective protection and locking mechanisms.
Innovation Solution
A folding tool with a longitudinally slidable blade guard and a locking mechanism that securely locks the blade in the open position and releases to allow folding, featuring a resilient clip and spring-activated button for safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a folding knife has a blade longer than the handle, then the knife can be useful for cutting larger fillets, but the exposed blade portion when closed creates safety risks
Solution Approach 1:
A blade guard is introduced as an intermediary component between the blade and the external environment. The guard slides along the blade to cover the exposed portion when the knife is closed, eliminating the safety hazard while preserving the long blade design for cutting larger fillets.
Solution Approach 2:
The blade guard is designed to be dynamically movable rather than fixed. It slides along the blade length and can be positioned at different locations depending on whether the knife is open or closed, allowing the system to adapt its protection level based on operational state.
2Object-affected harmful factors
If a blade guard is added to protect the exposed blade, then safety is improved, but the device complexity increases
Solution Approach 1:
The blade guard serves multiple functions simultaneously: it protects the user from the exposed blade, provides a finger grip surface when closing the knife, and acts as a visual indicator of the knife's open/closed state. This multi-functionality justifies the added component without proportionally increasing complexity.
Solution Approach 2:
The blade guard is integrated with the handle assembly through the slot mechanism, merging the protection function with the existing structural elements. The guard slides within a slot that is part of the handle, combining multiple components into a unified system rather than adding entirely separate elements.
3Reliability
If a locking mechanism is added to secure the blade in open position, then reliability is improved, but the device complexity increases
Solution Approach 1:
The locking mechanism is designed to be self-actuating through spring-loaded buttons that automatically engage with the blade tang when the knife is opened. The spring force provides automatic locking without requiring additional actuators or complex control systems, maintaining simplicity while ensuring reliable locking.
Solution Approach 2:
The locking function is extracted as a separate, modular mechanism independent of the blade guard system. The buttons and spring assembly form a distinct locking subsystem that operates separately from the sliding guard, allowing each component to be optimized for its specific function without interfering with the other.
4Ease of operation
If the blade guard is made longitudinally slidable in a slot, then ease of operation is improved, but the device complexity increases
Solution Approach 1:
The blade guard utilizes a slender, elongated form factor that fits within a narrow slot in the handle. This thin-profile design allows the guard to slide smoothly along the blade length without requiring complex guidance mechanisms, achieving ease of operation through geometric simplicity rather than mechanical complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively shields the blade when folded and securely locks it in the open position, enhancing safety and usability by preventing accidental exposure and ensuring stable locking engagement.
Implementation Method 1
spring-activated button
Implementation Method 2
resilient clip
Data Source
AI summary
A hand tool such as a fillet knife or limb saw with a blade that is longer than the handle has a blade guard arm that shields the blade when in the closed position. The blade guard arm is longitudinally slidable in the tool handle and engages the blade tang when the blade is in the open position, thereby locking the blade open.